10 WP3.2 Extended self-organized cavities With tapered amplifier from FBH and IAF: Self-organization on the longitudinal structure Interaction with Unott, FBH and IAF: improvement of beam characteristics At 960 nm (IAF) or 810 nm (FBH): Single longitudinal mode > 700 mw; SMSR > 30 db; Coherence > 1 m; M 2 <2 Tests outside the lab (ESPCI Paris) on a biomedical experiment Transfer of this knowledge to a SME (Laserlabs) for commercialisation This document and any data included are the property of Thales. They cannot be reproduced, disclosed or used without Thales' prior written approval. 9

12 11 Bright Er General idea : Interference in the SC laser of a pump and probe beam create a gain grating. Through 2WM / 4WM in we can create a phase conjugate beam With an external feedback mirror: a phase conjugate oscillator which can provide : - Spatial / Spectral mode filtering - Phase distorsion compensation - Phase locking of lasers of the bar

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17 16 Pressure and temperature tuning Bright Er

18 UNIPRESS in WP3: temperature and pressure tuning High pressure and low temperature increase the bandgap in laser-diode active layer, shifting the gain and emission to shorter wavelengths In BRIGHTER we perform pressure/temperature tuning in external cavity, using gratings or photorefractive crystals for creating external cavity Combining wide-range tuning with external resonator methods allows to combine the merits of both methods This document and any data included are the property of Thales. They cannot be reproduced, disclosed or used without Thales' prior written approval. 17

21 20 UNIPRESS in WP5: degradation rates for temperature cycles Red lasers from Osram were mounted on Cu, Ag, AlN, and Si and cooled down to 80K over 20 times. No degradation for AlN and Si submounts (Au/Sn solder), high degradation rate for Cu and Ag but, in most cases, the In solder degraded, not the laser chip!

22 21 Bright Er - Conclusions Very effective methods for mode filtering and increase of the SC Laser brightness : wavelength multiplexing, Bragg gratings Very significant progress on the NL approaches allowing dynamic mode control with 2WM : large potential to achieve both mode control and phase locking of the individual lasers of a bar

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